Simplex 2120 FABT McCulloh Loop Board Troubleshooting

B implex McCulloh Multiplex Procedure electrical power when making any internal or and servicing be performed by qualified Simplex Representa REQUIREMENT removing power from this system disconnect FIRST and AC powar last When connecting to this system connect AC power FIRST and last publication provides trouble isolation procedures for the FABT McCulloh loop board McCulloh loop board is used on FABTs to provide McCulloh loop Class A operation for FABT monitor point 1 through 4 Monitor point 5 on the associated FABT is used to report McCulloh loop troubles monitor 6 through 8 may be used as normal of the way that the McCulloh loop board operates a special procedure is required to locate the McCulloh monitor point that is actually in trouble The BMUX only knows that there is a M cCulloh loop trouble being by an FABT This procedure is outlined below proceeding notify appropriate building personnel and local authorities fire department that you will be working on the 2120 system RECEIVING A MCCULLOH LOOP TROUBLE REPORT Determine which FABT reported the McCulloh loop trouble via the BMUX trouble report Go to that FABT and observe the McCulloh loop board Look at the LEDs on the McCulloh loop board just located to isolate the troubled zone s LED 1 trouble on monitor point 1 LED 2 indicates trouble on monitor point 2 etc Repair the trouble in the indicated monitor point circuit wiring Press the BMUX DETECTOR RESET pushbutton The McCulloh loop trouble will clear and the McCulloh loop board will resume normal operation are two versions of the McCulloh loop board that you may encounter The 562 318 McCulloh loop board used only with 562 312 FABTs This board is now The 562 550 McCulloh loop board used only with 562 531 FABTs these two McCulloh loop boards look the same ARE NOT INTERCHANGEABLE 9 86 1966 Simpler Tlme Recorder Gardner Mass 01441.0001 Manuals Online Manuals Online